[0] => Subject Math was included
[1] => The Student Rafael was included
[2] => The Student Vinicius was included
[3] => The Teacher Marcus Brasizza was included
[4] => The Student Rafael was removed
[5] => Comes from Vinicius: I'm a student of Math
[6] => Comes from Marcus Brasizza: I teach in Math

)

Second Subject

Array (

[0] => Subject English was included
[1] => The Teacher Renato was included
[2] => The Student Vinicius was included
[3] => The Student Fabio was included
[4] => The Student tiago was included
[5] => Comes from Renato: I teach in English
[6] => Comes from Vinicius: I'm a student of English
[7] => Comes from Fabio: I'm a student of English
[8] => Comes from tiago: I'm a student of English